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Unformatted text preview: Fall 2009 EE40 Homework #1 Solutions Problem 1 a) Electrons are attracted to the most positive potential, so: g G g g G b) First, find the charge that the battery must supply: g g C Convert this to the number of electrons N using the charge on a single electron e : c) The energy cost equals the price of the battery divided by the energy delivered (in kilowatt- hours). g g 0.1 A 75 h 1.2 V 9 Wh Enery cost $0.50 9 Wh $/kWh kWh kWh kWh Problem 2 a) First, find the power in the voltage source. Its voltage is given (10 V), and the current is fixed by the current source (2 A into the positive terminal), so we see that it is dissipating 20 W . The resistor has the same current, and we see from Ohms law that it has a voltage of 10 V....
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